pv/data/analogsegment.hpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef PULSEVIEW_PV_DATA_ANALOGSEGMENT_HPP
  21 #define PULSEVIEW_PV_DATA_ANALOGSEGMENT_HPP
  22
  23 #include "segment.hpp"
  24
  25 #include <utility>
  26 #include <vector>
  27
  28 namespace AnalogSegmentTest {
  29 struct Basic;
  30 }
  31
  32 namespace pv {
  33 namespace data {
  34
  35 class AnalogSegment : public Segment
  36 {
  37 public:
  38         struct EnvelopeSample
  39         {
  40                 float min;
  41                 float max;
  42         };
  43
  44         struct EnvelopeSection
  45         {
  46                 uint64_t start;
  47                 unsigned int scale;
  48                 uint64_t length;
  49                 EnvelopeSample *samples;
  50         };
  51
  52 private:
  53         struct Envelope
  54         {
  55                 uint64_t length;
  56                 uint64_t data_length;
  57                 EnvelopeSample *samples;
  58         };
  59
  60 private:
  61         static const unsigned int ScaleStepCount = 10;
  62         static const int EnvelopeScalePower;
  63         static const int EnvelopeScaleFactor;
  64         static const float LogEnvelopeScaleFactor;
  65         static const uint64_t EnvelopeDataUnit;
  66
  67 public:
  68         AnalogSegment(uint64_t samplerate, uint64_t expected_num_samples = 0);
  69
  70         virtual ~AnalogSegment();
  71
  72         void append_interleaved_samples(const float *data,
  73                 size_t sample_count, size_t stride);
  74
  75         const float* get_samples(int64_t start_sample,
  76                 int64_t end_sample) const;
  77
  78         void get_envelope_section(EnvelopeSection &s,
  79                 uint64_t start, uint64_t end, float min_length) const;
  80
  81 private:
  82         void reallocate_envelope(Envelope &e);
  83
  84         void append_payload_to_envelope_levels();
  85
  86 private:
  87         struct Envelope envelope_levels_[ScaleStepCount];
  88
  89         friend struct AnalogSegmentTest::Basic;
  90 };
  91
  92 } // namespace data
  93 } // namespace pv
  94
  95 #endif // PULSEVIEW_PV_DATA_ANALOGSEGMENT_HPP